Voyant Market Assumptions

Does anyone have any advice for updating the Market Assumptions on Voyant in terms of what they use for the assumptions and how often you do so?

We are fairly new to Voyant so are a bit unsure as to how this bit of the system works.

I was thinking of using FE Analytics to produce the data for the various sectors (UK Fixed Interest, OS Fixed Interest, Property, etc), and then running over 20 years but it would be good to hear what other people do.

Would it be better contacting some of the DFMs/fund managers we use to get their predictions of the future returns from the sectors rather than use past returns given that Voyant is forward looking instead of looking at historic data?